We have been developing our word addin using ADX since Word 2010 and have upgraded to Word 2019 late last year. The addin can be deployed via manual double click msi or creating SCCM package to be deployed.

but since this week the addin cannot be loaded with error "Not loaded. A runtime error occurred during the loading of the COM Add-in." in COM Add-ins dialog box within Word - Options - Add-ins.

godfrey ho writes:
Also checking the adxregistrator.log also gave me an error:

You pass adxregistrator.exe ... /privileges=admin while the user running the installer is not an admin. To raise a warning when a user (not an admin) runs such an installer you should check that your add-in and setup project follow instruction given in section Deploying a per-machine Office extension via an MSI installer, see the PDF file in the folder {Add-in Express}\Docs on your development PC.

This contradicts to using adxregistrator.exe ... /privileges=admin. You should decide whether you deploy a per-machine or per-user add-in. Note that a per-machine add-in should be installed by starting setup.exe, not by double-clicking the .MSI.

godfrey ho writes:
FYI We have been using version 8.7.4425.0

Make sure all Add-in Express files that you use have this version on them.

This technology is now available for our custom development services only. Based on the Add-in Express for Office core, it is designed for building custom-tailored Office add-ins with far less coding than you usually have to do. Plus, it includes all Add-in Express features such as True RAD, visual designers, Outlook view and form regions, etc.

Get the best platform for building version-neutral, fast and easy deployable plug-ins by using Add-in Express projects templates, visual designers, components and wizards in combination with a perfect Delphi compiler.

This is an extension for Visual Studio that allows developers to quickly create WiX-based setup projects in a familiar Visual Studio way.

The Designer for WiX Toolset lets you forget the plain Windows Installer XML and concentrate on your deployment logic. It integrates several editors with the Visual Studio IDE and provides a set of vdproj designers to configure the file system, registry, user interface, custom actions, launch conditions and more for your setup projects.

The innovative technology for customizing Outlook views and forms. It is included in all Add-in Express for Office products and can be used to extend Outlook views, e-mail, task and appointment windows, To-Do bar, Reading and Navigation panes with your own custom sub-panes.

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